refactor: Modular inbound/outbound manager

adapter/inbound/manager.go

@@ -0,0 +1,143 @@
+package inbound
+
+import (
+	"context"
+	"os"
+	"sync"
+
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/common/taskmonitor"
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/log"
+	"github.com/sagernet/sing/common"
+	E "github.com/sagernet/sing/common/exceptions"
+)
+
+var _ adapter.InboundManager = (*Manager)(nil)
+
+type Manager struct {
+	logger       log.ContextLogger
+	registry     adapter.InboundRegistry
+	access       sync.Mutex
+	started      bool
+	stage        adapter.StartStage
+	inbounds     []adapter.Inbound
+	inboundByTag map[string]adapter.Inbound
+}
+
+func NewManager(logger log.ContextLogger, registry adapter.InboundRegistry) *Manager {
+	return &Manager{
+		logger:       logger,
+		registry:     registry,
+		inboundByTag: make(map[string]adapter.Inbound),
+	}
+}
+
+func (m *Manager) Start(stage adapter.StartStage) error {
+	m.access.Lock()
+	defer m.access.Unlock()
+	if m.started && m.stage >= stage {
+		panic("already started")
+	}
+	m.started = true
+	m.stage = stage
+	for _, inbound := range m.inbounds {
+		err := adapter.LegacyStart(inbound, stage)
+		if err != nil {
+			return E.Cause(err, stage.Action(), " inbound/", inbound.Type(), "[", inbound.Tag(), "]")
+		}
+	}
+	return nil
+}
+
+func (m *Manager) Close() error {
+	m.access.Lock()
+	if !m.started {
+		panic("not started")
+	}
+	m.started = false
+	inbounds := m.inbounds
+	m.inbounds = nil
+	m.access.Unlock()
+	monitor := taskmonitor.New(m.logger, C.StopTimeout)
+	var err error
+	for _, inbound := range inbounds {
+		monitor.Start("close inbound/", inbound.Type(), "[", inbound.Tag(), "]")
+		err = E.Append(err, inbound.Close(), func(err error) error {
+			return E.Cause(err, "close inbound/", inbound.Type(), "[", inbound.Tag(), "]")
+		})
+		monitor.Finish()
+	}
+	return nil
+}
+
+func (m *Manager) Inbounds() []adapter.Inbound {
+	m.access.Lock()
+	defer m.access.Unlock()
+	return m.inbounds
+}
+
+func (m *Manager) Get(tag string) (adapter.Inbound, bool) {
+	m.access.Lock()
+	defer m.access.Unlock()
+	inbound, found := m.inboundByTag[tag]
+	return inbound, found
+}
+
+func (m *Manager) Remove(tag string) error {
+	m.access.Lock()
+	inbound, found := m.inboundByTag[tag]
+	if !found {
+		m.access.Unlock()
+		return os.ErrInvalid
+	}
+	delete(m.inboundByTag, tag)
+	index := common.Index(m.inbounds, func(it adapter.Inbound) bool {
+		return it == inbound
+	})
+	if index == -1 {
+		panic("invalid inbound index")
+	}
+	m.inbounds = append(m.inbounds[:index], m.inbounds[index+1:]...)
+	started := m.started
+	m.access.Unlock()
+	if started {
+		return inbound.Close()
+	}
+	return nil
+}
+
+func (m *Manager) Create(ctx context.Context, router adapter.Router, logger log.ContextLogger, tag string, outboundType string, options any) error {
+	inbound, err := m.registry.Create(ctx, router, logger, tag, outboundType, options)
+	if err != nil {
+		return err
+	}
+	m.access.Lock()
+	defer m.access.Unlock()
+	if m.started {
+		for _, stage := range adapter.ListStartStages {
+			err = adapter.LegacyStart(inbound, stage)
+			if err != nil {
+				return E.Cause(err, stage.Action(), " inbound/", inbound.Type(), "[", inbound.Tag(), "]")
+			}
+		}
+	}
+	if existsInbound, loaded := m.inboundByTag[tag]; loaded {
+		if m.started {
+			err = existsInbound.Close()
+			if err != nil {
+				return E.Cause(err, "close inbound/", existsInbound.Type(), "[", existsInbound.Tag(), "]")
+			}
+		}
+		existsIndex := common.Index(m.inbounds, func(it adapter.Inbound) bool {
+			return it == existsInbound
+		})
+		if existsIndex == -1 {
+			panic("invalid inbound index")
+		}
+		m.inbounds = append(m.inbounds[:existsIndex], m.inbounds[existsIndex+1:]...)
+	}
+	m.inbounds = append(m.inbounds, inbound)
+	m.inboundByTag[tag] = inbound
+	return nil
+}